Ever wondered why the other EU countries didn't make much of a fuss over Brexit? It's because the UK had many privileges from the times when it was needed to establish the EU... and then it didn't even join the Euro. The UK has been an entry point for English speaking businesses into the European market, but it kept all the benefits from that behind an exchange barrier, which is not in the interest of the rest of EU countries. Now, many of those businesses will leave the UK and establish operations in the EU-Eurozone proper, directly contributing to strengthening the Euro instead of the GBP, which will become a further incentive for countries to stay in the EU.
As for the UK, there are other ways for it to survive and even thrive, but whether it will be good or not so much for most of its citizens, remains to be seen.